Christmas tree ornament



FIG. 1 is a front elevation of a Christmas tree ornament showing my new design;

FIG. 2 is a left side elevation view thereof, the right side being a mirror image;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design of a Christmas tree ornament, as shown and described. 